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I have been using NGK coppers ever since i owned the legend. No complaints about the performance of copper, just change the spark plugs on time and there wont be any hindered performance. I cant really say if platinums or iridiums are better (performance wise) because i never used them. Correct me if im wrong but their sole purpose is just to extent the life span of a plug to like 100,000 mi depend or which plug u buy.
 
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